Formula for the derivative (#3) is wrong. No one talks about this.https://twitter.com/ValaAfshar/status/833349598718607362 …
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Yeah. Nobody seems to have noticed in the replies. Although Twitter probably just hid them all!